--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.aarch64/src/org/graalvm/compiler/replacements/aarch64/AArch64GraphBuilderPlugins.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.aarch64/src/org/graalvm/compiler/replacements/aarch64/AArch64GraphBuilderPlugins.java	Mon May 06 21:50:20 2019 +0200
@@ -59,7 +59,13 @@
 
 public class AArch64GraphBuilderPlugins {
 
-    public static void register(Plugins plugins, BytecodeProvider bytecodeProvider, boolean explicitUnsafeNullChecks, boolean registerMathPlugins) {
+    public static void register(Plugins plugins, BytecodeProvider bytecodeProvider, boolean explicitUnsafeNullChecks,
+                    boolean registerMathPlugins) {
+        register(plugins, bytecodeProvider, explicitUnsafeNullChecks, registerMathPlugins, true);
+    }
+
+    public static void register(Plugins plugins, BytecodeProvider bytecodeProvider, boolean explicitUnsafeNullChecks,
+                    boolean registerMathPlugins, boolean emitJDK9StringSubstitutions) {
         InvocationPlugins invocationPlugins = plugins.getInvocationPlugins();
         invocationPlugins.defer(new Runnable() {
             @Override
@@ -69,8 +75,10 @@
                 if (registerMathPlugins) {
                     registerMathPlugins(invocationPlugins);
                 }
-                registerStringLatin1Plugins(invocationPlugins, bytecodeProvider);
-                registerStringUTF16Plugins(invocationPlugins, bytecodeProvider);
+                if (emitJDK9StringSubstitutions) {
+                    registerStringLatin1Plugins(invocationPlugins, bytecodeProvider);
+                    registerStringUTF16Plugins(invocationPlugins, bytecodeProvider);
+                }
                 registerUnsafePlugins(invocationPlugins, bytecodeProvider);
                 // This is temporarily disabled until we implement correct emitting of the CAS
                 // instructions of the proper width.